Multiple hand arc lamp



June 24, 1930. M. J. WOHL 1,767,029

MULTIPLE HAND ARC LAMP Filed Jan. 6, 1926' ammn'co'd Maurz'ae J T470111.

331 MB Gum/m;

Patented June 24, 1930 MAURICE J. WOI-IL, OF LONG ISLAND CITY, NEW YORK MULTIPLE HAND ARC LAMP Application filed January 6, 1926. Serial No. 79,567.

This invention relates to electric arc lamps of the hand operated type and particularly to multiple lamps of that type which are used for photographic and medical purposes.

It is theobject of this invention to provide a lamp which can be easily manipulated by an unskilled operator.

It is the further object of the invention to provide a lamp which is rugged in construcembodying the invention.

Fig. 2 is a side elevation of Fig. 1 seen in the direction of arrows 2-2 of said figure.

Fig. 3 is a horizontal sectional plan on line 33 of Fig.1.

Fig. 4 is a vertical detail section on line 4+4 of Fig. 2.

Fig. 5 is a horizontal section on line 5-5 of Fig. 4.

Referring to Fig. 1 of the drawings, 11 is a vertical plate provided with horizontal pivot bolts 12 at its middle portion which support this plate rotatably in a forked yoke 18 to which it may be clamped by means of I wing nuts 14. Yoke 13 is supported at its bottom part by a ferrule 15 upon a vertical post 16 forming a vertical pivot for said ferrule which may be clamped thereto by a Wing screw 17. The post 16 is the upper part of a stand to support the lamp upon the floor or any other suitable surface. The plate 11 carries at its rear side by means of brackets 18 two resistance coils l9 and 19 and on its front three horizontal arms 202l and 22 which are insulated from plate 11 as illustrated in Fig. 3. The upper arm 20 holdsat its front end a carbon holder 23 of the tubular, clamping type which permits the carbon electrode 24 to pass there through and to be clamped thereby. The middle arm 21 and lower arm 22 each hold at their front ends a hollow cylindrical barrel 25 and 26 of like construction illustrated in details in Fig. 4. These barrels are arranged on a common Vertical axis with that of electrode 24 and each of them holds an electrode in axial alinement therewith. The lowest electrode 28 holds at its bottom end a handle or button 29 which is preferably fastened thereto by a spring clamp 29 To this handle one of the current terminals 30 is connected. Barrel 25 (and also 26 which is of the same construction) consists of a cylindrical tubular shell 25 closed at the top by a plate 25" and at the bottom by plate 25 The electrode 27 passes freely through central apertures in these plates and is encircled within the barrel by a friction ring 31 which is preferably made by winding a helical spring around the electrode and joining the two ends of the spring to each other. A plurality of washers 32 of different thickness is fastened to the underside of top plate 25 and a loose collar 33 forming a weight, rests upon the friction ring 31 leaving a space between its upper surface and the lower face of washers 32. To the lower side of the plate 25 a protecting plate 25 of heat resisting material as asbestos or the like is fastened, this plate is not provided on barrel 26.

The wiring of the lamp is as follows:

The positive line wire is connected to a terminal post held insulated on plate 11, from where the current passes through resistance coil l9 to carbon holder arm 20 and through all three electrodes, forming two arcs, to the lowest carbon holder arm 22 by means of a flexible lead 34. The negative line conductor is connected to a terminal post 41 held insulated on the rear side of plate 11 and connected'to arm 22. From post 40 a branch line runs through a switch 42 to the upper end of resistance coil 19 and through the same connects to the positive carbon holder arm 20. By closing the switch 42 both resistance coils l9 the friction ring tetslide thereon When the top of electrode 28 reaches the lower end of electrode 27 the latter is alao.llfted.;.11pward and after the friction ring 31 and weight 33 contained in barrel 25 have reached the lowest washer 32 of this barrel elmtrode 27 begins to slide through its friction collar and continues to do so until its upper end reaches electrode 24 and the liftmotion is arrested. The hand is then removed from button 29 and each one of the electrodes falls by its own gravity assisted by that of thewei' ht 33 which encircles it, the distance throu which its friction collar 31 was lifted wit in its barrel. This distanee is equal to the distance between the to of each w ight 33 and bottom washer 32 be ore the liftin movement commenced. The lowering of 't e electrodes causes arcs to be formed between the ends of electrodes 24 ands)? .and between 27 and 28. As often as this are formin operation may be reeated .the lan h 0 am formed is equal to he length of ree movement of the friction 31 in the barrel of the movable electr' e forming said are. It is evident that this free movement for electrode 28 is twice as long for electrode 27 as the former electrodeihas to recede. from its highest osition first the length of movement 0 the pipper electrode, forming the upper a'rc and en'the length of the lower are formed between 27 and 28. The action of weights 33 is required for'electrodes of light weight when the plate 11 is .in slanted position and friction may prevent the free movement of the electrodes through the apertures in plat'e's25 and 25".

j It will be seen that by the combination of the are forming means and the electrode holders the number of parts is greatly renot be gauged dueed.

The operation of the lam is also made very simple as the length 0 the arcs need to proper length. lamp is a very desirable one for photographic purposes, where a large volume '0 l1 ht is required for general illumination. he arcs when once established hold steady .lon enough for an exposure and when they Ermine too long can be restored to orig'mal'length with facility and without disturbing the exposure, by a single manipulation of one hand.

On account of its simplicity and the reduction in the number of parts, this lamp can be manufactured and sold for a smaller price than lamps of similar character.

It will be clear to any one skilled in the art that the mechanical construction of the lamp can be easily designed to operate the two arcs in multiple, or to operate Qnl a single arc, ,and that these and such ot er changes in the construction be made as fall within the scope of the appended claims, without departure from the spirit of the invention.

Having than described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In an arc lamp, a support, a pair-of electrodes, an arm holding one electrode in fixed position on said support, a secondarm fixed on said support and embracing the other electrode to let said'electrode slide through said arm for feeding, and are forming means adapted to limit the len h of are, on the supporting arm of other electrode.

2. In an arc. lamp, asupport, a pair of electrodes, one of which tends to move in one direction, a pair of-arms on said support, one of said arms bein provided with electrode cla'mpingmeans, t e other arm being provided with a container through which said electrode passes, said container forming a guide for the movable electrode supported thereby and means confined therein to adjust the position .of the electrode along said guide when the electrode is moved against the force tending to restore it and permitted to return to normal position.

3. In an arc lam a su port, a pair of electrodes, a pair 0 arms ed on said support holding said electrodes on said support in axial alinement with each other, an electrode holder on each arm, one of said holders being provided with means to clamp its electrode, the other holder ,being provided with guides ermittingthe electrode to slide freely theret rough for feeding, with means to form an arc and with means to limit the length of are held on the electrode.

4. In an arc lamp, a support, a ,pair of electrodes, arms connect said support, an electro e holder on each arm, means to clamp the electrode on one of said holders, means to guide the other electrode longitudinally, means to form. an arc, and friction means to hold said other elec trode slidably" in its holder to permit its feeding therethrough.

5. In an ,arc lamp, a support, a 'r of electrodes, arms connecting said e ectrode'j to said support, an electrode holder on each arm, means to form an arc and means to gauge the length of said are, enclosed-within one of said holders.

6. In an arc lamp support, a pair of elec r;

said electrodes to trodes, means for holding each electrode on said support for arc forming, one of said holding means being provided with means in frictional engagement with its electrode and permitting feeding movement of the electrode therethrough, and means co-operating with said friction means to limit movement of the electrode in one direction.

7. In an arc lamp, a support, a plurality of electrode holders rigidly held on said support in axial alinement with each other, an electrode in each holder, means to hold one of said electrodes forming one end of the line stationary in its holder, means to support the other electrodes movably in their holders, and are forming means on each holder of a movable electrode.

8. In an arc lamp, a support, a plurality of electrode holders rigidly attached to said support, electrodes in said holders forming a straight line with each other, the electrode forming one end of said line being stationary, the other electrodes being movable in their holders, the electrode forming the other end of said line being adapted for manual operation and forming means to feed the other movable electrodes consecutively and to formoarcs between all electrodes by its release.

9. In an arc lamp, a support, a plurality of electrodes arranged to form arcs between their abutting ends, holders for said electrodes held stationary on said support, one of said electrodes being clamped to its holder, and the other electrodes being slidably held in their holders, means adapted for manual operation, to feed said slidable electrodes consecutively towards said clamped electrode and means on their holders to form arcs between all electrodes.

10. In an arc lamp, a fixed electrode and a plurality of other electrodes, means mounting said other electrodes to move towards and away from said fixed electrode, means to separate the electrodes from each other and means on said mounting means for feeding the electrodes gradually therethrough.

' 11. In an arc lamp, a fixed electrode, and a second electrode, means mounting said second electrode to move towards and away from said fixed electrode, said means including a friction collar to hold the electrode in different positions and means permitting a limited movement of said collar, to provide arc forming means for said electrode.

In testimony whereof, I have signed my name to this specification, this 16 day of December 1925.

' MAURICE J. WOHL. 

